Rainbird ARV050 Air Relief Valve. The Rain Bird ARV050 is a 1/2" Air Relief Kit for the Rain Bird XF inline emitter tubing and XFS sub-surface emitter tubing. This 1/2" air relief valve is compactly designed for systems up to 6.5gpm, it reduces the risk of back siphoning debris into the dripline, and is ideal for sub-surface installation.
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